[PATCH v3 38/43] drm/rockchip: Cancel PSR enable work before changing the state

Thierry Escande
2018-01-30T20:31:43Z

From: Tomasz Figa <tfiga@chromium.org>

If we change the state first and reschedule later, we might have the
work executed according to previous scheduled time and end up with PSR
re-enabled instantly. Let's cancel the work before changing the state.

While at it, consolidate psr_disable_handler() to just call
rockchip_drm_do_flush(), as they are both supposed to do the same.

Signed-off-by: Tomasz Figa <tfiga@chromium.org>
Signed-off-by: Thierry Escande <thierry.escande@collabora.com>
---
drivers/gpu/drm/rockchip/rockchip_drm_psr.c | 20 ++++++++------------
1 file changed, 8 insertions(+), 12 deletions(-)

diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_psr.c b/drivers/gpu/drm/rockchip/rockchip_drm_psr.c
index a107845ba97c..c8655e625ba2 100644
--- a/drivers/gpu/drm/rockchip/rockchip_drm_psr.c
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_psr.c
@@ -138,18 +138,6 @@ static void psr_flush_handler(struct work_struct *work)
mutex_unlock(&psr->lock);
}

-static void psr_disable_handler(struct work_struct *work)
-{
- struct psr_drv *psr = container_of(work, struct psr_drv, disable_work);
-
- /* If the state has changed since we initiated the flush, do nothing */
- mutex_lock(&psr->lock);
- if (psr->state == PSR_ENABLE)
- psr_set_state_locked(psr, PSR_FLUSH);
- mutex_unlock(&psr->lock);
- mod_delayed_work(system_wq, &psr->flush_work, PSR_FLUSH_TIMEOUT_MS);
-}
-
/**
* rockchip_drm_psr_activate - activate PSR on the given pipe
* @encoder: encoder to obtain the PSR encoder
@@ -198,6 +186,7 @@ EXPORT_SYMBOL(rockchip_drm_psr_deactivate);

static void rockchip_drm_do_flush(struct psr_drv *psr)
{
+ cancel_delayed_work_sync(&psr->flush_work);
psr_set_state(psr, PSR_FLUSH);
mod_delayed_work(system_wq, &psr->flush_work, PSR_FLUSH_TIMEOUT_MS);
}
@@ -244,6 +233,13 @@ void rockchip_drm_psr_flush_all(struct drm_device *dev)
}
EXPORT_SYMBOL(rockchip_drm_psr_flush_all);

+static void psr_disable_handler(struct work_struct *work)
+{
+ struct psr_drv *psr = container_of(work, struct psr_drv, disable_work);
+
+ rockchip_drm_do_flush(psr);
+}
+
static void psr_input_event(struct input_handle *handle,
unsigned int type, unsigned int code,
int value)
--
2.14.1